The angle, the orb and how often it happens
A conjunction means the same ecliptic longitude, and the orb here is eight degrees. Pluto needs about two hundred and forty eight years for a full circuit, so on any human timescale it is a fixed point and the Sun makes the aspect single handed, crossing the sixteen degree band in roughly a fortnight each year.
That is four or five births in a hundred. Pluto's orbit is strongly elliptical, so it spends anywhere from about twelve to just over thirty years in a sign, which means the sign of the conjunction identifies a generation rather than a person.
Pluto is retrograde for close to half of every year. A natal retrograde Pluto is therefore the ordinary case and does not make a conjunction more significant.
Purpose and the thing that will not be talked out of it
The Sun stands for conscious purpose, vitality and the sense of being a particular person. Pluto stands for what is buried, for compulsion, and for power that operates without asking permission. The tradition also gives it destruction and renewal, though the more usable core is simply that Pluto marks the places where a person does not bargain.
A conjunction fuses. So instead of someone who has an intense area of life, the reading gives someone whose intensity is not separable from their identity. Descriptions tend towards words like driven, private and hard to deflect. The recurring caveat is that the person rarely experiences it as intensity, because there is no unintense version of themselves to compare it with.
The classic difficulty attached to the aspect is control, in both directions: exerting it and reacting badly to it. That is a reading, not a diagnosis, and how much of it applies depends entirely on placement. The same structure is elsewhere described as endurance, which is the more temperate word for the same observation and probably the more accurate one.
What makes it yours
Everyone born within that fortnight has the aspect, so nothing personal comes from the pairing itself. The house does the individual work. Sun conjunct Pluto in the second house is read very differently from the same conjunction in the ninth, and the difference is not a nuance, it is most of the meaning.
Houses need a birth time, and they turn about a degree every four minutes. If your time is rounded to the hour, treat the house as provisional. Without a time, the honest reading stops at the sign, which you share with a very large number of people. That is a real limit rather than a formality, and a page that reads a houseless Pluto conjunction confidently is inventing the part that mattered.
Weighting the aspect properly
Inside two degrees this conjunction is a defining structure and usually recognisable immediately. Between two and five it is real and shares the stage with other things. Beyond five, and especially across a sign boundary, it thins out, and a chart carrying it at seven degrees with nothing else touching Pluto is better read without the heavy language.
What lifts it out of the background is contact with a personal point: an angle, the Moon, or a tight aspect from a fast body to the same degrees. A generational contact that touches nothing else in the chart is background, and pages that promise otherwise are selling something.
The widget above gives the orb, the sign and the house, which is where the reading stops being generic.
Questions people ask about this
Is Sun conjunct Pluto rare?
No. It occurs for about a fortnight of births each year, roughly four or five per cent of charts, because Pluto barely moves and the Sun makes the whole aspect on its own.
Does Sun conjunct Pluto mean I am obsessed with power?
That is the keyword and it overreaches. The tradition reads the pairing as identity fused with what a person will not negotiate. How that appears, and whether it appears at all, depends on the house, the orb and the rest of the chart.
Does Pluto still count as a planet here?
Astronomically it is classified as a dwarf planet. Astrologically it is still read, and the site treats it as a body in the chart while keeping the astronomy and the interpretation clearly separate.
My Pluto is retrograde. Does that matter?
Barely. Pluto is retrograde for close to half of each year, so a natal retrograde Pluto is the ordinary case rather than a signal, and the conjunction is read much the same either way.
Why does the house matter so much?
Because the aspect is shared by everyone born in the same fortnight. The sign is generational, spanning twelve to thirty years depending on where Pluto is in its elliptical orbit. Only the house separates one of those charts from another.
What if my orb is six or seven degrees?
Then treat it as background unless something else in the chart repeats the theme. Look for other contacts to the same degrees, particularly from the Moon or an angle, before giving the conjunction any weight.